/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.security.ntlm;
import java.util.Arrays;
import java.util.Locale;
/**
* The NTLM server, not multi-thread enabled.<p>
* Example:
* <pre>
* Server server = new Server(null, "REALM") {
* public char[] getPassword(String ntdomain, String username) {
* switch (username) {
* case "dummy": return "t0pSeCr3t".toCharArray();
* case "guest": return "".toCharArray();
* default: return null;
* }
* }
* };
* // Receive client request as type1
* byte[] type2 = server.type2(type1, nonce);
* // Send type2 to client and receive type3
* verify(type3, nonce);
* </pre>
*/
public abstract class Server extends NTLM {
final private String domain;
final private boolean allVersion;
/**
* Creates a Server instance.
* @param version the NTLM version to use, which can be:
* <ul>
* <li>NTLM: Original NTLM v1
* <li>NTLM2: NTLM v1 with Client Challenge
* <li>NTLMv2: NTLM v2
* </ul>
* If null, all versions will be supported. Please note that unless NTLM2
* is selected, authentication succeeds if one of LM (or LMv2) or
* NTLM (or NTLMv2) is verified.
* @param domain the domain, must not be null
* @throws NTLMException if {@code domain} is null.
*/
public Server(String version, String domain) throws NTLMException {
super(version);
if (domain == null) {
throw new NTLMException(NTLMException.PROTOCOL,
"domain cannot be null");
}
this.allVersion = (version == null);
this.domain = domain;
debug("NTLM Server: (t,version) = (%s,%s)\n", domain, version);
}
/**
* Generates the Type 2 message
* @param type1 the Type1 message received, must not be null
* @param nonce the random 8-byte array to be used in message generation,
* must not be null
* @return the message generated
* @throws NTLMException if the incoming message is invalid, or
* {@code nonce} is null.
*/
public byte[] type2(byte[] type1, byte[] nonce) throws NTLMException {
if (nonce == null) {
throw new NTLMException(NTLMException.PROTOCOL,
"nonce cannot be null");
}
debug("NTLM Server: Type 1 received\n");
if (type1 != null) debug(type1);
Writer p = new Writer(2, 32);
int flags = 0x80205;
p.writeSecurityBuffer(12, domain, true);
p.writeInt(20, flags);
p.writeBytes(24, nonce);
debug("NTLM Server: Type 2 created\n");
debug(p.getBytes());
return p.getBytes();
}
/**
* Verifies the Type3 message received from client and returns
* various negotiated information.
* @param type3 the incoming Type3 message from client, must not be null
* @param nonce the same nonce provided in {@link #type2}, must not be null
* @return username and hostname of the client in a byte array
* @throws NTLMException if the incoming message is invalid, or
* {@code nonce} is null.
*/
public String[] verify(byte[] type3, byte[] nonce)
throws NTLMException {
if (type3 == null || nonce == null) {
throw new NTLMException(NTLMException.PROTOCOL,
"type1 or nonce cannot be null");
}
debug("NTLM Server: Type 3 received\n");
if (type3 != null) debug(type3);
Reader r = new Reader(type3);
String username = r.readSecurityBuffer(36, true);
String hostname = r.readSecurityBuffer(44, true);
String incomingDomain = r.readSecurityBuffer(28, true);
/*if (incomingDomain != null && !incomingDomain.equals(domain)) {
throw new NTLMException(NTLMException.DOMAIN_UNMATCH,
"Wrong domain: " + incomingDomain +
" vs " + domain); // Needed?
}*/
boolean verified = false;
char[] password = getPassword(domain, username);
if (password == null) {
throw new NTLMException(NTLMException.USER_UNKNOWN,
"Unknown user");
}
byte[] incomingLM = r.readSecurityBuffer(12);
byte[] incomingNTLM = r.readSecurityBuffer(20);
if (!verified && (allVersion || v == Version.NTLM)) {
if (incomingLM.length > 0) {
byte[] pw1 = getP1(password);
byte[] lmhash = calcLMHash(pw1);
byte[] lmresponse = calcResponse (lmhash, nonce);
if (Arrays.equals(lmresponse, incomingLM)) {
verified = true;
}
}
if (incomingNTLM.length > 0) {
byte[] pw2 = getP2(password);
byte[] nthash = calcNTHash(pw2);
byte[] ntresponse = calcResponse (nthash, nonce);
if (Arrays.equals(ntresponse, incomingNTLM)) {
verified = true;
}
}
debug("NTLM Server: verify using NTLM: " + verified + "\n");
}
if (!verified && (allVersion || v == Version.NTLM2)) {
byte[] pw2 = getP2(password);
byte[] nthash = calcNTHash(pw2);
byte[] clientNonce = Arrays.copyOf(incomingLM, 8);
byte[] ntlmresponse = ntlm2NTLM(nthash, clientNonce, nonce);
if (Arrays.equals(incomingNTLM, ntlmresponse)) {
verified = true;
}
debug("NTLM Server: verify using NTLM2: " + verified + "\n");
}
if (!verified && (allVersion || v == Version.NTLMv2)) {
byte[] pw2 = getP2(password);
byte[] nthash = calcNTHash(pw2);
if (incomingLM.length > 0) {
byte[] clientNonce = Arrays.copyOfRange(
incomingLM, 16, incomingLM.length);
byte[] lmresponse = calcV2(nthash,
username.toUpperCase(Locale.US)+incomingDomain,
clientNonce, nonce);
if (Arrays.equals(lmresponse, incomingLM)) {
verified = true;
}
}
if (incomingNTLM.length > 0) {
byte[] clientBlob = Arrays.copyOfRange(
incomingNTLM, 16, incomingNTLM.length);
byte[] ntlmresponse = calcV2(nthash,
username.toUpperCase(Locale.US)+incomingDomain,
clientBlob, nonce);
if (Arrays.equals(ntlmresponse, incomingNTLM)) {
verified = true;
}
}
debug("NTLM Server: verify using NTLMv2: " + verified + "\n");
}
if (!verified) {
throw new NTLMException(NTLMException.AUTH_FAILED,
"None of LM and NTLM verified");
}
return new String[] {username, hostname};
}
/**
* Retrieves the password for a given user. This method should be
* overridden in a concrete class.
* @param domain can be null
* @param username must not be null
* @return the password for the user, or null if unknown
*/
public abstract char[] getPassword(String domain, String username);
}